| 摘要 |
1,060,996. Laminates. RADIO CORPORATION OF AMERICA. Oct. 21, 1964 [Oct. 23, 1963], No. 42925/64. Heading B5N. [Also in Divisions H1 and H3] A method of making a magnetic structure, such as a magnetic memory array, comprises forming a green ferrite sheet with depressions such as grooves in it, applying a slurry of non- magnetic particles, 0À5-5Á in size, in a carbonaceous binder solution, allowing the slurry to dry, brushing off the surplus, laminating with another green ferrite sheet, and firing to leave a ferrite body having an imbedded pattern of compacted non-magnetic particles. The green ferrite sheet may be formed of calcined ZnMgMn ferrite with a binder, and made by spreading the mixture on a plate with a raised pattern, to a thickness of 0À001-0À02 inch and drying. The slurry is formed by dispersing the particles in an aqueous solution of sugar and honey. The particles may be Pd, Pt, Rh, Re or alloys thereof with Au or Ag if the imbedded parts are to be conductive, i.e. conductors or shields, or MgO or SnO if these parts are non-conductive for limiting flux paths. The green ferrite sheets may be laminated together by pressing for 10 minutes at 90-105‹ C. The laminated sheet is heated to 200-400‹ C., and then sintered at 1200‹ C. After cooling in air the structure is annealed in N 2 at 1100‹ C. During the sintering the sugar binder is driven off, this loss in volume corresponding with the shrinkage of the ferrite. Several green ferrite sheets may be laminated together to form a multilayer structure. |
